<?php

/*
  TbsZip version 2.14-beta
  Date    : 2013-06-03
  Author  : Skrol29 (email: http://www.tinybutstrong.com/onlyyou.html)
  Licence : LGPL
  This class is independent from any other classes and has been originally created for the OpenTbs plug-in
  for TinyButStrong Template Engine (TBS). OpenTbs makes TBS able to merge OpenOffice and Ms Office documents.
  Visit http://www.tinybutstrong.com
 */

namespace RHX\Helper\Docx;

define('TBSZIP_DOWNLOAD', 1);   // download (default)
define('TBSZIP_NOHEADER', 4);   // option to use with DOWNLOAD: no header is sent
define('TBSZIP_FILE', 8);       // output to file  , or add from file
define('TBSZIP_STRING', 32);    // output to string, or add from string

class clsTbsZip {
    
    public $ArchIsNew;
    public $ArchIsStream;
    public $ReplByPos;

    function __construct() {
	$this->Meth8Ok		 = extension_loaded('zlib'); // check if Zlib extension is available. This is need for compress and uncompress with method 8.
	$this->DisplayError	 = true;
	$this->ArchFile		 = '';
	$this->Error		 = false;
    }

    function CreateNew($ArchName = 'new.zip') {
	// Create a new virtual empty archive, the name will be the default name when the archive is flushed.
	if (!isset($this->Meth8Ok))
	    $this->__construct();  // for PHP 4 compatibility
	$this->Close(); // note that $this->ArchHnd is set to false here
	$this->Error	 = false;
	$this->ArchFile	 = $ArchName;
	$this->ArchIsNew = true;
	$bin		 = 'PK' . chr(05) . chr(06) . str_repeat(chr(0), 18);
	$this->CdEndPos	 = strlen($bin) - 4;
	$this->CdInfo	 = array('disk_num_curr' => 0, 'disk_num_cd' => 0, 'file_nbr_curr' => 0, 'file_nbr_tot' => 0, 'l_cd' => 0, 'p_cd' => 0, 'l_comm' => 0, 'v_comm' => '', 'bin' => $bin);
	$this->CdPos	 = $this->CdInfo['p_cd'];
    }

    function Open($ArchFile, $UseIncludePath = false) {
	// Open the zip archive
	if (!isset($this->Meth8Ok))
	    $this->__construct();  // for PHP 4 compatibility
	$this->Close(); // close handle and init info
	$this->Error		 = false;
	$this->ArchIsNew	 = false;
	$this->ArchIsStream	 = (is_resource($ArchFile) && (get_resource_type($ArchFile) == 'stream'));
	if ($this->ArchIsStream) {
	    $this->ArchFile	 = 'from_stream.zip';
	    $this->ArchHnd	 = $ArchFile;
	}
	else {
	    // open the file
	    $this->ArchFile	 = $ArchFile;
	    $this->ArchHnd	 = fopen($ArchFile, 'rb', $UseIncludePath);
	}
	$ok	 = !($this->ArchHnd === false);
	if ($ok)
	    $ok	 = $this->CentralDirRead();
	return $ok;
    }

    function Close() {
	if (isset($this->ArchHnd) and ($this->ArchHnd !== false))
	    fclose($this->ArchHnd);
	$this->ArchFile		 = '';
	$this->ArchHnd		 = false;
	$this->CdInfo		 = array();
	$this->CdFileLst	 = array();
	$this->CdFileNbr	 = 0;
	$this->CdFileByName	 = array();
	$this->VisFileLst	 = array();
	$this->ArchCancelModif();
    }

    function ArchCancelModif() {
	$this->LastReadComp	 = false; // compression of the last read file (1=compressed, 0=stored not compressed, -1= stored compressed but read uncompressed)
	$this->LastReadIdx	 = false;  // index of the last file read
	$this->ReplInfo		 = array();
	$this->ReplByPos	 = array();
	$this->AddInfo		 = array();
    }

    function FileAdd($Name, $Data, $DataType = TBSZIP_STRING, $Compress = true) {

	if ($Data === false)
	    return $this->FileCancelModif($Name, false); // Cancel a previously added file

	    
// Save information for adding a new file into the archive
	$Diff		 = 30 + 46 + 2 * strlen($Name); // size of the header + cd info
	$Ref		 = $this->_DataCreateNewRef($Data, $DataType, $Compress, $Diff, $Name);
	if ($Ref === false)
	    return false;
	$Ref['name']	 = $Name;
	$this->AddInfo[] = $Ref;
	return $Ref['res'];
    }

    function CentralDirRead() {
	$cd_info = 'PK' . chr(05) . chr(06); // signature of the Central Directory
	$cd_pos	 = -22;
	$this->_MoveTo($cd_pos, SEEK_END);
	$b	 = $this->_ReadData(4);
	if ($b !== $cd_info)
	    return $this->RaiseError('The End of Central Rirectory Record is not found.');

	$this->CdEndPos	 = ftell($this->ArchHnd) - 4;
	$this->CdInfo	 = $this->CentralDirRead_End($cd_info);
	$this->CdFileLst = array();
	$this->CdFileNbr = $this->CdInfo['file_nbr_curr'];
	$this->CdPos	 = $this->CdInfo['p_cd'];

	if ($this->CdFileNbr <= 0)
	    return $this->RaiseError('No header found in the Central Directory.');
	if ($this->CdPos <= 0)
	    return $this->RaiseError('No position found for the Central Directory.');

	$this->_MoveTo($this->CdPos);
	for ($i = 0; $i < $this->CdFileNbr; $i++) {
	    $x = $this->CentralDirRead_File($i);
	    if ($x !== false) {
		$this->CdFileLst[$i]			 = $x;
		$this->CdFileByName[$x['v_name']]	 = $i;
	    }
	}
	return true;
    }

    function CentralDirRead_End($cd_info) {
	$b			 = $cd_info . $this->_ReadData(18);
	$x			 = array();
	$x['disk_num_curr']	 = $this->_GetDec($b, 4, 2);  // number of this disk
	$x['disk_num_cd']	 = $this->_GetDec($b, 6, 2);    // number of the disk with the start of the central directory
	$x['file_nbr_curr']	 = $this->_GetDec($b, 8, 2);  // total number of entries in the central directory on this disk
	$x['file_nbr_tot']	 = $this->_GetDec($b, 10, 2);  // total number of entries in the central directory
	$x['l_cd']		 = $this->_GetDec($b, 12, 4);	  // size of the central directory
	$x['p_cd']		 = $this->_GetDec($b, 16, 4);	  // position of start of central directory with respect to the starting disk number
	$x['l_comm']		 = $this->_GetDec($b, 20, 2);	// .ZIP file comment length
	$x['v_comm']		 = $this->_ReadData($x['l_comm']); // .ZIP file comment
	$x['bin']		 = $b . $x['v_comm'];
	return $x;
    }

    function CentralDirRead_File($idx) {

	$b = $this->_ReadData(46);

	$x = $this->_GetHex($b, 0, 4);
	if ($x !== 'h:02014b50')
	    return $this->RaiseError("Signature of Central Directory Header #" . $idx . " (file information) expected but not found at position " . $this->_TxtPos(ftell($this->ArchHnd) - 46) . ".");

	$x			 = array();
	$x['vers_used']		 = $this->_GetDec($b, 4, 2);
	$x['vers_necess']	 = $this->_GetDec($b, 6, 2);
	$x['purp']		 = $this->_GetBin($b, 8, 2);
	$x['meth']		 = $this->_GetDec($b, 10, 2);
	$x['time']		 = $this->_GetDec($b, 12, 2);
	$x['date']		 = $this->_GetDec($b, 14, 2);
	$x['crc32']		 = $this->_GetDec($b, 16, 4);
	$x['l_data_c']		 = $this->_GetDec($b, 20, 4);
	$x['l_data_u']		 = $this->_GetDec($b, 24, 4);
	$x['l_name']		 = $this->_GetDec($b, 28, 2);
	$x['l_fields']		 = $this->_GetDec($b, 30, 2);
	$x['l_comm']		 = $this->_GetDec($b, 32, 2);
	$x['disk_num']		 = $this->_GetDec($b, 34, 2);
	$x['int_file_att']	 = $this->_GetDec($b, 36, 2);
	$x['ext_file_att']	 = $this->_GetDec($b, 38, 4);
	$x['p_loc']		 = $this->_GetDec($b, 42, 4);
	$x['v_name']		 = $this->_ReadData($x['l_name']);
	$x['v_fields']		 = $this->_ReadData($x['l_fields']);
	$x['v_comm']		 = $this->_ReadData($x['l_comm']);

	$x['bin'] = $b . $x['v_name'] . $x['v_fields'] . $x['v_comm'];

	return $x;
    }

    function RaiseError($Msg) {
	if ($this->DisplayError)
	    echo '<strong>' . get_class($this) . ' ERROR :</strong> ' . $Msg . '<br>' . "\r\n";
	$this->Error = $Msg;
	return false;
    }

    function Debug($FileHeaders = false) {

	$this->DisplayError = true;

	if ($FileHeaders) {
	    // Calculations first in order to have error messages before other information
	    $idx		 = 0;
	    $pos		 = 0;
	    $pos_stop	 = $this->CdInfo['p_cd'];
	    $this->_MoveTo($pos);
	    while (($pos < $pos_stop) && ($ok		 = $this->_ReadFile($idx, false))) {
		$this->VisFileLst[$idx]['p_this_header (debug_mode only)']	 = $pos;
		$pos								 = ftell($this->ArchHnd);
		$idx++;
	    }
	}

	$nl = "\r\n";
	echo "<pre>";

	echo "-------------------------------" . $nl;
	echo "End of Central Directory record" . $nl;
	echo "-------------------------------" . $nl;
	print_r($this->DebugArray($this->CdInfo));

	echo $nl;
	echo "-------------------------" . $nl;
	echo "Central Directory headers" . $nl;
	echo "-------------------------" . $nl;
	print_r($this->DebugArray($this->CdFileLst));

	if ($FileHeaders) {
	    echo $nl;
	    echo "------------------" . $nl;
	    echo "Local File headers" . $nl;
	    echo "------------------" . $nl;
	    print_r($this->DebugArray($this->VisFileLst));
	}

	echo "</pre>";
    }

    function DebugArray($arr) {
	foreach ($arr as $k => $v) {
	    if (is_array($v)) {
		$arr[$k] = $this->DebugArray($v);
	    }
	    elseif (substr($k, 0, 2) == 'p_') {
		$arr[$k] = $this->_TxtPos($v);
	    }
	}
	return $arr;
    }

    function FileExists($NameOrIdx) {
	return ($this->FileGetIdx($NameOrIdx) !== false);
    }

    function FileGetIdx($NameOrIdx) {
	// Check if a file name, or a file index exists in the Central Directory, and return its index
	if (is_string($NameOrIdx)) {
	    if (isset($this->CdFileByName[$NameOrIdx])) {
		return $this->CdFileByName[$NameOrIdx];
	    }
	    else {
		return false;
	    }
	}
	else {
	    if (isset($this->CdFileLst[$NameOrIdx])) {
		return $NameOrIdx;
	    }
	    else {
		return false;
	    }
	}
    }

    function FileGetIdxAdd($Name) {
	// Check if a file name exists in the list of file to add, and return its index
	if (!is_string($Name))
	    return false;
	$idx_lst = array_keys($this->AddInfo);
	foreach ($idx_lst as $idx) {
	    if ($this->AddInfo[$idx]['name'] === $Name)
		return $idx;
	}
	return false;
    }

    function FileRead($NameOrIdx, $Uncompress = true) {

	$this->LastReadComp	 = false; // means the file is not found
	$this->LastReadIdx	 = false;

	$idx = $this->FileGetIdx($NameOrIdx);
	if ($idx === false)
	    return $this->RaiseError('File "' . $NameOrIdx . '" is not found in the Central Directory.');

	$pos = $this->CdFileLst[$idx]['p_loc'];
	$this->_MoveTo($pos);

	$this->LastReadIdx = $idx; // Can be usefull to get the idx

	$Data = $this->_ReadFile($idx, true);

	// Manage uncompression
	$Comp	 = 1; // means the contents stays compressed
	$meth	 = $this->CdFileLst[$idx]['meth'];
	if ($meth == 8) {
	    if ($Uncompress) {
		if ($this->Meth8Ok) {
		    $Data	 = gzinflate($Data);
		    $Comp	 = -1; // means uncompressed
		}
		else {
		    $this->RaiseError('Unable to uncompress file "' . $NameOrIdx . '" because extension Zlib is not installed.');
		}
	    }
	}
	elseif ($meth == 0) {
	    $Comp = 0; // means stored without compression
	}
	else {
	    if ($Uncompress)
		$this->RaiseError('Unable to uncompress file "' . $NameOrIdx . '" because it is compressed with method ' . $meth . '.');
	}
	$this->LastReadComp = $Comp;

	return $Data;
    }

    function _ReadFile($idx, $ReadData) {
	// read the file header (and maybe the data ) in the archive, assuming the cursor in at a new file position

	$b = $this->_ReadData(30);

	$x = $this->_GetHex($b, 0, 4);
	if ($x !== 'h:04034b50')
	    return $this->RaiseError("Signature of Local File Header #" . $idx . " (data section) expected but not found at position " . $this->_TxtPos(ftell($this->ArchHnd) - 30) . ".");

	$x		 = array();
	$x['vers']	 = $this->_GetDec($b, 4, 2);
	$x['purp']	 = $this->_GetBin($b, 6, 2);
	$x['meth']	 = $this->_GetDec($b, 8, 2);
	$x['time']	 = $this->_GetDec($b, 10, 2);
	$x['date']	 = $this->_GetDec($b, 12, 2);
	$x['crc32']	 = $this->_GetDec($b, 14, 4);
	$x['l_data_c']	 = $this->_GetDec($b, 18, 4);
	$x['l_data_u']	 = $this->_GetDec($b, 22, 4);
	$x['l_name']	 = $this->_GetDec($b, 26, 2);
	$x['l_fields']	 = $this->_GetDec($b, 28, 2);
	$x['v_name']	 = $this->_ReadData($x['l_name']);
	$x['v_fields']	 = $this->_ReadData($x['l_fields']);

	$x['bin'] = $b . $x['v_name'] . $x['v_fields'];

	// Read Data
	if (isset($this->CdFileLst[$idx])) {
	    $len_cd = $this->CdFileLst[$idx]['l_data_c'];
	    if ($x['l_data_c'] == 0) {
		// Sometimes, the size is not specified in the local information.
		$len = $len_cd;
	    }
	    else {
		$len = $x['l_data_c'];
		if ($len != $len_cd) {
		    //echo "TbsZip Warning: Local information for file #".$idx." says len=".$len.", while Central Directory says len=".$len_cd.".";
		}
	    }
	}
	else {
	    $len = $x['l_data_c'];
	    if ($len == 0)
		$this->RaiseError("File Data #" . $idx . " cannt be read because no length is specified in the Local File Header and its Central Directory information has not been found.");
	}

	if ($ReadData) {
	    $Data = $this->_ReadData($len);
	}
	else {
	    $this->_MoveTo($len, SEEK_CUR);
	}

	// Description information
	$desc_ok = ($x['purp'][2 + 3] == '1');
	if ($desc_ok) {
	    $b	 = $this->_ReadData(12);
	    $s	 = $this->_GetHex($b, 0, 4);
	    $d	 = 0;
	    // the specification says the signature may or may not be present
	    if ($s == 'h:08074b50') {
		$b .= $this->_ReadData(4);
		$d		 = 4;
		$x['desc_bin']	 = $b;
		$x['desc_sign']	 = $s;
	    }
	    else {
		$x['desc_bin'] = $b;
	    }
	    $x['desc_crc32']	 = $this->_GetDec($b, 0 + $d, 4);
	    $x['desc_l_data_c']	 = $this->_GetDec($b, 4 + $d, 4);
	    $x['desc_l_data_u']	 = $this->_GetDec($b, 8 + $d, 4);
	}

	// Save file info without the data
	$this->VisFileLst[$idx] = $x;

	// Return the info
	if ($ReadData) {
	    return $Data;
	}
	else {
	    return true;
	}
    }

    function FileReplace($NameOrIdx, $Data, $DataType = TBSZIP_STRING, $Compress = true) {
	// Store replacement information.

	$idx = $this->FileGetIdx($NameOrIdx);
	if ($idx === false)
	    return $this->RaiseError('File "' . $NameOrIdx . '" is not found in the Central Directory.');

	$pos = $this->CdFileLst[$idx]['p_loc'];

	if ($Data === false) {
	    // file to delete
	    $this->ReplInfo[$idx]	 = false;
	    $Result			 = true;
	}
	else {
	    // file to replace
	    $Diff			 = - $this->CdFileLst[$idx]['l_data_c'];
	    $Ref			 = $this->_DataCreateNewRef($Data, $DataType, $Compress, $Diff, $NameOrIdx);
	    if ($Ref === false)
		return false;
	    $this->ReplInfo[$idx]	 = $Ref;
	    $Result			 = $Ref['res'];
	}

	$this->ReplByPos[$pos] = $idx;

	return $Result;
    }

    /**
     * Return the state of the file.
     * @return {string} 'u'=unchanged, 'm'=modified, 'd'=deleted, 'a'=added, false=unknown
     */
    function FileGetState($NameOrIdx) {

	$idx = $this->FileGetIdx($NameOrIdx);
	if ($idx === false) {
	    $idx = $this->FileGetIdxAdd($NameOrIdx);
	    if ($idx === false) {
		return false;
	    }
	    else {
		return 'a';
	    }
	}
	elseif (isset($this->ReplInfo[$idx])) {
	    if ($this->ReplInfo[$idx] === false) {
		return 'd';
	    }
	    else {
		return 'm';
	    }
	}
	else {
	    return 'u';
	}
    }

    function FileCancelModif($NameOrIdx, $ReplacedAndDeleted = true) {
	// cancel added, modified or deleted modifications on a file in the archive
	// return the number of cancels

	$nbr = 0;

	if ($ReplacedAndDeleted) {
	    // replaced or deleted files
	    $idx = $this->FileGetIdx($NameOrIdx);
	    if ($idx !== false) {
		if (isset($this->ReplInfo[$idx])) {
		    $pos = $this->CdFileLst[$idx]['p_loc'];
		    unset($this->ReplByPos[$pos]);
		    unset($this->ReplInfo[$idx]);
		    $nbr++;
		}
	    }
	}

	// added files
	$idx = $this->FileGetIdxAdd($NameOrIdx);
	if ($idx !== false) {
	    unset($this->AddInfo[$idx]);
	    $nbr++;
	}

	return $nbr;
    }

    function Flush($Render = TBSZIP_DOWNLOAD, $File = '', $ContentType = '') {

	if (($File !== '') && ($this->ArchFile === $File)) {
	    $this->RaiseError('Method Flush() cannot overwrite the current opened archive: \'' . $File . '\''); // this makes corrupted zip archives without PHP error.
	    return false;
	}

	$ArchPos	 = 0;
	$Delta		 = 0;
	$FicNewPos	 = array();
	$DelLst		 = array(); // idx of deleted files
	$DeltaCdLen	 = 0; // delta of the CD's size

	$now	 = time();
	$date	 = $this->_MsDos_Date($now);
	$time	 = $this->_MsDos_Time($now);

	if (!$this->OutputOpen($Render, $File, $ContentType))
	    return false;

	// output modified zipped files and unmodified zipped files that are beetween them
	ksort($this->ReplByPos);
	foreach ($this->ReplByPos as $ReplPos => $ReplIdx) {
	    // output data from the zip archive which is before the data to replace
	    $this->OutputFromArch($ArchPos, $ReplPos);
	    // get current file information
	    if (!isset($this->VisFileLst[$ReplIdx]))
		$this->_ReadFile($ReplIdx, false);
	    $FileInfo	 = & $this->VisFileLst[$ReplIdx];
	    $b1		 = $FileInfo['bin'];
	    if (isset($FileInfo['desc_bin'])) {
		$b2 = $FileInfo['desc_bin'];
	    }
	    else {
		$b2 = '';
	    }
	    $info_old_len	 = strlen($b1) + $this->CdFileLst[$ReplIdx]['l_data_c'] + strlen($b2); // $FileInfo['l_data_c'] may have a 0 value in some archives
	    // get replacement information
	    $ReplInfo	 = & $this->ReplInfo[$ReplIdx];
	    if ($ReplInfo === false) {
		// The file is to be deleted
		$Delta			 = $Delta - $info_old_len; // headers and footers are also deleted
		$DelLst[$ReplIdx]	 = true;
	    }
	    else {
		// prepare the header of the current file
		$this->_DataPrepare($ReplInfo); // get data from external file if necessary
		$this->_PutDec($b1, $time, 10, 2); // time
		$this->_PutDec($b1, $date, 12, 2); // date
		$this->_PutDec($b1, $ReplInfo['crc32'], 14, 4); // crc32
		$this->_PutDec($b1, $ReplInfo['len_c'], 18, 4); // l_data_c
		$this->_PutDec($b1, $ReplInfo['len_u'], 22, 4); // l_data_u
		if ($ReplInfo['meth'] !== false)
		    $this->_PutDec($b1, $ReplInfo['meth'], 8, 2); // meth
		    
// prepare the bottom description if the zipped file, if any
		if ($b2 !== '') {
		    $d = (strlen($b2) == 16) ? 4 : 0; // offset because of the signature if any
		    $this->_PutDec($b2, $ReplInfo['crc32'], $d + 0, 4); // crc32
		    $this->_PutDec($b2, $ReplInfo['len_c'], $d + 4, 4); // l_data_c
		    $this->_PutDec($b2, $ReplInfo['len_u'], $d + 8, 4); // l_data_u
		}
		// output data
		$this->OutputFromString($b1 . $ReplInfo['data'] . $b2);
		unset($ReplInfo['data']); // save PHP memory
		$Delta = $Delta + $ReplInfo['diff'] + $ReplInfo['len_c'];
	    }
	    // Update the delta of positions for zipped files which are physically after the currently replaced one
	    for ($i = 0; $i < $this->CdFileNbr; $i++) {
		if ($this->CdFileLst[$i]['p_loc'] > $ReplPos) {
		    $FicNewPos[$i] = $this->CdFileLst[$i]['p_loc'] + $Delta;
		}
	    }
	    // Update the current pos in the archive
	    $ArchPos = $ReplPos + $info_old_len;
	}

	// Ouput all the zipped files that remain before the Central Directory listing
	if ($this->ArchHnd !== false)
	    $this->OutputFromArch($ArchPos, $this->CdPos); // ArchHnd is false if CreateNew() has been called
	$ArchPos = $this->CdPos;

	// Output file to add
	$AddNbr		 = count($this->AddInfo);
	$AddDataLen	 = 0; // total len of added data (inlcuding file headers)
	if ($AddNbr > 0) {
	    $AddPos	 = $ArchPos + $Delta; // position of the start
	    $AddLst	 = array_keys($this->AddInfo);
	    foreach ($AddLst as $idx) {
		$n = $this->_DataOuputAddedFile($idx, $AddPos);
		$AddPos += $n;
		$AddDataLen += $n;
	    }
	}

	// Modifiy file information in the Central Directory for replaced files
	$b2		 = '';
	$old_cd_len	 = 0;
	for ($i = 0; $i < $this->CdFileNbr; $i++) {
	    $b1 = $this->CdFileLst[$i]['bin'];
	    $old_cd_len += strlen($b1);
	    if (!isset($DelLst[$i])) {
		if (isset($FicNewPos[$i]))
		    $this->_PutDec($b1, $FicNewPos[$i], 42, 4);   // p_loc
		if (isset($this->ReplInfo[$i])) {
		    $ReplInfo = & $this->ReplInfo[$i];
		    $this->_PutDec($b1, $time, 12, 2); // time
		    $this->_PutDec($b1, $date, 14, 2); // date
		    $this->_PutDec($b1, $ReplInfo['crc32'], 16, 4); // crc32
		    $this->_PutDec($b1, $ReplInfo['len_c'], 20, 4); // l_data_c
		    $this->_PutDec($b1, $ReplInfo['len_u'], 24, 4); // l_data_u
		    if ($ReplInfo['meth'] !== false)
			$this->_PutDec($b1, $ReplInfo['meth'], 10, 2); // meth
		}
		$b2 .= $b1;
	    }
	}
	$this->OutputFromString($b2);
	$ArchPos += $old_cd_len;
	$DeltaCdLen = $DeltaCdLen + strlen($b2) - $old_cd_len;

	// Output until "end of central directory record"
	if ($this->ArchHnd !== false)
	    $this->OutputFromArch($ArchPos, $this->CdEndPos); // ArchHnd is false if CreateNew() has been called

	    
// Output file information of the Central Directory for added files
	if ($AddNbr > 0) {
	    $b2 = '';
	    foreach ($AddLst as $idx) {
		$b2 .= $this->AddInfo[$idx]['bin'];
	    }
	    $this->OutputFromString($b2);
	    $DeltaCdLen += strlen($b2);
	}

	// Output "end of central directory record"
	$b2	 = $this->CdInfo['bin'];
	$DelNbr	 = count($DelLst);
	if (($AddNbr > 0) or ($DelNbr > 0)) {
	    // total number of entries in the central directory on this disk
	    $n	 = $this->_GetDec($b2, 8, 2);
	    $this->_PutDec($b2, $n + $AddNbr - $DelNbr, 8, 2);
	    // total number of entries in the central directory
	    $n	 = $this->_GetDec($b2, 10, 2);
	    $this->_PutDec($b2, $n + $AddNbr - $DelNbr, 10, 2);
	    // size of the central directory
	    $n	 = $this->_GetDec($b2, 12, 4);
	    $this->_PutDec($b2, $n + $DeltaCdLen, 12, 4);
	    $Delta	 = $Delta + $AddDataLen;
	}
	$this->_PutDec($b2, $this->CdPos + $Delta, 16, 4); // p_cd  (offset of start of central directory with respect to the starting disk number)
	$this->OutputFromString($b2);

	$this->OutputClose();

	return true;
    }

    // ----------------
    // output functions
    // ----------------

    function OutputOpen($Render, $File, $ContentType) {

	if (($Render & TBSZIP_FILE) == TBSZIP_FILE) {
	    $this->OutputMode	 = TBSZIP_FILE;
	    if ('' . $File == '')
		$File			 = basename($this->ArchFile) . '.zip';
	    $this->OutputHandle	 = @fopen($File, 'w');
	    if ($this->OutputHandle === false) {
		$this->RaiseError('Method Flush() cannot overwrite the target file \'' . $File . '\'. This may not be a valid file path or the file may be locked by another process or because of a denied permission.');
		return false;
	    }
	}
	elseif (($Render & TBSZIP_STRING) == TBSZIP_STRING) {
	    $this->OutputMode	 = TBSZIP_STRING;
	    $this->OutputSrc	 = '';
	}
	elseif (($Render & TBSZIP_DOWNLOAD) == TBSZIP_DOWNLOAD) {
	    $this->OutputMode	 = TBSZIP_DOWNLOAD;
	    // Output the file
	    if ('' . $File == '')
		$File			 = basename($this->ArchFile);
	    if (($Render & TBSZIP_NOHEADER) == TBSZIP_NOHEADER) {
		
	    }
	    else {
		header('Pragma: no-cache');
		if ($ContentType != '')
		    header('Content-Type: ' . $ContentType);
		header('Content-Disposition: attachment; filename="' . $File . '"');
		header('Expires: 0');
		header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
		header('Cache-Control: public');
		header('Content-Description: File Transfer');
		header('Content-Transfer-Encoding: binary');
		$Len = $this->_EstimateNewArchSize();
		if ($Len !== false)
		    header('Content-Length: ' . $Len);
	    }
	}

	return true;
    }

    function OutputFromArch($pos, $pos_stop) {
	$len	 = $pos_stop - $pos;
	if ($len < 0)
	    return;
	$this->_MoveTo($pos);
	$block	 = 1024;
	while ($len > 0) {
	    $l	 = min($len, $block);
	    $x	 = $this->_ReadData($l);
	    $this->OutputFromString($x);
	    $len	 = $len - $l;
	}
	unset($x);
    }

    function OutputFromString($data) {
	if ($this->OutputMode === TBSZIP_DOWNLOAD) {
	    echo $data; // donwload
	}
	elseif ($this->OutputMode === TBSZIP_STRING) {
	    $this->OutputSrc .= $data; // to string
	}
	elseif (TBSZIP_FILE) {
	    fwrite($this->OutputHandle, $data); // to file
	}
    }

    function OutputClose() {
	if (($this->OutputMode === TBSZIP_FILE) && ($this->OutputHandle !== false)) {
	    fclose($this->OutputHandle);
	    $this->OutputHandle = false;
	}
    }

    // ----------------
    // Reading functions
    // ----------------

    function _MoveTo($pos, $relative = SEEK_SET) {
	fseek($this->ArchHnd, $pos, $relative);
    }

    function _ReadData($len) {
	if ($len > 0) {
	    $x = fread($this->ArchHnd, $len);
	    return $x;
	}
	else {
	    return '';
	}
    }

    // ----------------
    // Take info from binary data
    // ----------------

    function _GetDec($txt, $pos, $len) {
	$x	 = substr($txt, $pos, $len);
	$z	 = 0;
	for ($i = 0; $i < $len; $i++) {
	    $asc	 = ord($x[$i]);
	    if ($asc > 0)
		$z	 = $z + $asc * pow(256, $i);
	}
	return $z;
    }

    function _GetHex($txt, $pos, $len) {
	$x = substr($txt, $pos, $len);
	return 'h:' . bin2hex(strrev($x));
    }

    function _GetBin($txt, $pos, $len) {
	$x	 = substr($txt, $pos, $len);
	$z	 = '';
	for ($i = 0; $i < $len; $i++) {
	    $asc = ord($x[$i]);
	    if (isset($x[$i])) {
		for ($j = 0; $j < 8; $j++) {
		    $z .= ($asc & pow(2, $j)) ? '1' : '0';
		}
	    }
	    else {
		$z .= '00000000';
	    }
	}
	return 'b:' . $z;
    }

    // ----------------
    // Put info into binary data
    // ----------------

    function _PutDec(&$txt, $val, $pos, $len) {
	$x = '';
	for ($i = 0; $i < $len; $i++) {
	    if ($val == 0) {
		$z = 0;
	    }
	    else {
		$z = intval($val % 256);
		if (($val < 0) && ($z != 0)) { // ($z!=0) is very important, example: val=-420085702
		    // special opration for negative value. If the number id too big, PHP stores it into a signed integer. For example: crc32('coucou') => -256185401 instead of  4038781895. NegVal = BigVal - (MaxVal+1) = BigVal - 256^4
		    $val	 = ($val - $z) / 256 - 1;
		    $z	 = 256 + $z;
		}
		else {
		    $val = ($val - $z) / 256;
		}
	    }
	    $x .= chr($z);
	}
	$txt = substr_replace($txt, $x, $pos, $len);
    }

    function _MsDos_Date($Timestamp = false) {
	// convert a date-time timstamp into the MS-Dos format
	$d = ($Timestamp === false) ? getdate() : getdate($Timestamp);
	return (($d['year'] - 1980) * 512) + ($d['mon'] * 32) + $d['mday'];
    }

    function _MsDos_Time($Timestamp = false) {
	// convert a date-time timstamp into the MS-Dos format
	$d = ($Timestamp === false) ? getdate() : getdate($Timestamp);
	return ($d['hours'] * 2048) + ($d['minutes'] * 32) + intval($d['seconds'] / 2); // seconds are rounded to an even number in order to save 1 bit
    }

    function _MsDos_Debug($date, $time) {
	// Display the formated date and time. Just for debug purpose.
	// date end time are encoded on 16 bits (2 bytes) : date = yyyyyyymmmmddddd , time = hhhhhnnnnnssssss
	$y	 = ($date & 65024) / 512 + 1980;
	$m	 = ($date & 480) / 32;
	$d	 = ($date & 31);
	$h	 = ($time & 63488) / 2048;
	$i	 = ($time & 1984) / 32;
	$s	 = ($time & 31) * 2; // seconds have been rounded to an even number in order to save 1 bit
	return $y . '-' . str_pad($m, 2, '0', STR_PAD_LEFT) . '-' . str_pad($d, 2, '0', STR_PAD_LEFT) . ' ' . str_pad($h, 2, '0', STR_PAD_LEFT) . ':' . str_pad($i, 2, '0', STR_PAD_LEFT) . ':' . str_pad($s, 2, '0', STR_PAD_LEFT);
    }

    function _TxtPos($pos) {
	// Return the human readable position in both decimal and hexa
	return $pos . " (h:" . dechex($pos) . ")";
    }

    function _DataOuputAddedFile($Idx, $PosLoc) {

	$Ref = & $this->AddInfo[$Idx];
	$this->_DataPrepare($Ref); // get data from external file if necessary
	// Other info
	$now	 = time();
	$date	 = $this->_MsDos_Date($now);
	$time	 = $this->_MsDos_Time($now);
	$len_n	 = strlen($Ref['name']);
	$purp	 = 2048; // purpose // +8 to indicates that there is an extended local header 
	// Header for file in the data section 
	$b = 'PK' . chr(03) . chr(04) . str_repeat(' ', 26); // signature
	$this->_PutDec($b, 20, 4, 2); //vers = 20
	$this->_PutDec($b, $purp, 6, 2); // purp
	$this->_PutDec($b, $Ref['meth'], 8, 2);  // meth
	$this->_PutDec($b, $time, 10, 2); // time
	$this->_PutDec($b, $date, 12, 2); // date
	$this->_PutDec($b, $Ref['crc32'], 14, 4); // crc32
	$this->_PutDec($b, $Ref['len_c'], 18, 4); // l_data_c
	$this->_PutDec($b, $Ref['len_u'], 22, 4); // l_data_u
	$this->_PutDec($b, $len_n, 26, 2); // l_name
	$this->_PutDec($b, 0, 28, 2); // l_fields
	$b .= $Ref['name']; // name
	$b .= ''; // fields
	// Output the data
	$this->OutputFromString($b . $Ref['data']);
	$OutputLen = strlen($b) + $Ref['len_c']; // new position of the cursor
	unset($Ref['data']); // save PHP memory
	// Information for file in the Central Directory
	$b = 'PK' . chr(01) . chr(02) . str_repeat(' ', 42); // signature
	$this->_PutDec($b, 20, 4, 2);  // vers_used = 20
	$this->_PutDec($b, 20, 6, 2);  // vers_necess = 20
	$this->_PutDec($b, $purp, 8, 2);  // purp
	$this->_PutDec($b, $Ref['meth'], 10, 2); // meth
	$this->_PutDec($b, $time, 12, 2); // time
	$this->_PutDec($b, $date, 14, 2); // date
	$this->_PutDec($b, $Ref['crc32'], 16, 4); // crc32
	$this->_PutDec($b, $Ref['len_c'], 20, 4); // l_data_c
	$this->_PutDec($b, $Ref['len_u'], 24, 4); // l_data_u
	$this->_PutDec($b, $len_n, 28, 2); // l_name
	$this->_PutDec($b, 0, 30, 2); // l_fields
	$this->_PutDec($b, 0, 32, 2); // l_comm
	$this->_PutDec($b, 0, 34, 2); // disk_num
	$this->_PutDec($b, 0, 36, 2); // int_file_att
	$this->_PutDec($b, 0, 38, 4); // ext_file_att
	$this->_PutDec($b, $PosLoc, 42, 4); // p_loc
	$b .= $Ref['name']; // v_name
	$b .= ''; // v_fields
	$b .= ''; // v_comm

	$Ref['bin'] = $b;

	return $OutputLen;
    }

    function _DataCreateNewRef($Data, $DataType, $Compress, $Diff, $NameOrIdx) {

	if (is_array($Compress)) {
	    $result		 = 2;
	    $meth		 = $Compress['meth'];
	    $len_u		 = $Compress['len_u'];
	    $crc32		 = $Compress['crc32'];
	    $Compress	 = false;
	}
	elseif ($Compress and ($this->Meth8Ok)) {
	    $result	 = 1;
	    $meth	 = 8;
	    $len_u	 = false; // means unknown
	    $crc32	 = false;
	}
	else {
	    $result		 = ($Compress) ? -1 : 0;
	    $meth		 = 0;
	    $len_u		 = false;
	    $crc32		 = false;
	    $Compress	 = false;
	}

	if ($DataType == TBSZIP_STRING) {
	    $path = false;
	    if ($Compress) {
		// we compress now in order to save PHP memory
		$len_u	 = strlen($Data);
		$crc32	 = crc32($Data);
		$Data	 = gzdeflate($Data);
		$len_c	 = strlen($Data);
	    }
	    else {
		$len_c = strlen($Data);
		if ($len_u === false) {
		    $len_u	 = $len_c;
		    $crc32	 = crc32($Data);
		}
	    }
	}
	else {
	    $path	 = $Data;
	    $Data	 = false;
	    if (file_exists($path)) {
		$fz	 = filesize($path);
		if ($len_u === false)
		    $len_u	 = $fz;
		$len_c	 = ($Compress) ? false : $fz;
	    } else {
		return $this->RaiseError("Cannot add the file '" . $path . "' because it is not found.");
	    }
	}

	// at this step $Data and $crc32 can be false only in case of external file, and $len_c is false only in case of external file to compress
	return array('data' => $Data, 'path' => $path, 'meth' => $meth, 'len_u' => $len_u, 'len_c' => $len_c, 'crc32' => $crc32, 'diff' => $Diff, 'res' => $result);
    }

    function _DataPrepare(&$Ref) {
	// returns the real size of data
	if ($Ref['path'] !== false) {
	    $Ref['data']	 = file_get_contents($Ref['path']);
	    if ($Ref['crc32'] === false)
		$Ref['crc32']	 = crc32($Ref['data']);
	    if ($Ref['len_c'] === false) {
		// means the data must be compressed
		$Ref['data']	 = gzdeflate($Ref['data']);
		$Ref['len_c']	 = strlen($Ref['data']);
	    }
	}
    }

    function _EstimateNewArchSize($Optim = true) {
	// Return the size of the new archive, or false if it cannot be calculated (because of external file that must be compressed before to be insered)

	if ($this->ArchIsNew) {
	    $Len = strlen($this->CdInfo['bin']);
	}
	elseif ($this->ArchIsStream) {
	    $x	 = fstat($this->ArchHnd);
	    $Len	 = $x['size'];
	}
	else {
	    $Len = filesize($this->ArchFile);
	}

	// files to replace or delete
	foreach ($this->ReplByPos as $i) {
	    $Ref = & $this->ReplInfo[$i];
	    if ($Ref === false) {
		// file to delete
		$Info = & $this->CdFileLst[$i];
		if (!isset($this->VisFileLst[$i])) {
		    if ($Optim)
			return false; // if $Optimization is set to true, then we d'ont rewind to read information
		    $this->_MoveTo($Info['p_loc']);
		    $this->_ReadFile($i, false);
		}
		$Vis = & $this->VisFileLst[$i];
		$Len += -strlen($Vis['bin']) - strlen($Info['bin']) - $Info['l_data_c'];
		if (isset($Vis['desc_bin']))
		    $Len += -strlen($Vis['desc_bin']);
	    } elseif ($Ref['len_c'] === false) {
		return false; // information not yet known
	    }
	    else {
		// file to replace
		$Len += $Ref['len_c'] + $Ref['diff'];
	    }
	}

	// files to add
	$i_lst = array_keys($this->AddInfo);
	foreach ($i_lst as $i) {
	    $Ref = & $this->AddInfo[$i];
	    if ($Ref['len_c'] === false) {
		return false; // information not yet known
	    }
	    else {
		$Len += $Ref['len_c'] + $Ref['diff'];
	    }
	}

	return $Len;
    }

}
